Os giken TC24 is that sort of money. 

P90 is a great head. My one is anyway 🙂

2 hours ago, Racer X said:

Seventeen thousand bucks for what head?

 

22 minutes ago, jonbill said:

Os giken TC24 is that sort of money. 

P90 is a great head. My one is anyway 🙂

As @jonbill mentioned, the OS Giken head is the pricy head. 

http://www.speedhunters.com/2013/02/engine-porn-os-giken-tc24-b1z/

https://www.thegentlemanracer.com/2013/11/os-giken-releases-l-series-head.html

I don't know if one for the L series is currently available, so I'm not sure if you could get one for just $17K.

1 hour ago, jonbill said:

Os giken TC24 is that sort of money. 

P90 is a great head. My one is anyway 🙂

 

37 minutes ago, SteveJ said:

 

As @jonbill mentioned, the OS Giken head is the pricy head. 

http://www.speedhunters.com/2013/02/engine-porn-os-giken-tc24-b1z/

https://www.thegentlemanracer.com/2013/11/os-giken-releases-l-series-head.html

I don't know if one for the L series is currently available, so I'm not sure if you could get one for just $17K.

Oh yeah. Isn't that head made from unobtanium? 

I can only dream of ever having something as awesome as a setup like that. 

There is that guy who made his own twin cam head for L series engines, 3D cad design, custom casting, CNC milled. I think that setup is even more money.

Of course you can spend plenty of money on an E31, P90, N47 . . . . . . . I think I'm into the E31 I have at least two grand when I built my first race engine. Other than new valves (missed a shift coming onto the front stretch at Seattle, on a new bottom end, kissed the valves - now I have a rev limiter) and guide seals, and later a different cam, I haven't spent any thing on it. It has been sitting since the last bottom end had a crank break between the last main and number 6 rod (the second in about 20 years of racing my Z on the West coast) at Thunderhill about 12 years ago. I am thinking of using it, and the race induction setup paired with a header and a bottom end I built for the brown car when I was married to Mrs, Racer 1.0. That engine was going to get a small chamber E88 head I have, but haven't finished yet. It is ironic that when I had the first crankshaft break, it was when I was building that other engine, and was pursuing a championship. So instead of finishing the E88 head, I put my E31 race head and intake/exhaust on it, and raced one meet with it. We had a long enough break before the next race that I was able to build another engine, and swap everything back. In my zeal to win the championship the engine got sidelined.

Then I divorced Mrs. Racer 1.0, bought some property, stayed focused on racing and the brown Z and the engine got parked.

That was about 26 years ago, more or less.

I met Mrs. Racer 2.0 about 23 years ago, and we wound up selling my place, and buying the place we have now, built a house, and the car(s) have been patiently waiting.

@Derek built his own head, among other things.

https://forums.hybridz.org/topic/119641-twin-cam-head-for-the-l6-from-derek-at-datsunworks/

http://datsunworks.com/

20 minutes ago, Zed Head said:

@Derek built his own head, among other things.

https://forums.hybridz.org/topic/119641-twin-cam-head-for-the-l6-from-derek-at-datsunworks/

http://datsunworks.com/

Yeah, that guy!

16 hours ago, jonbill said:

Os giken TC24 is that sort of money. 

P90 is a great head. My one is anyway 🙂

The P90 head is pretty much a P79 head without the exhaust liners. You still have to shave 2 mm and shim everything and use the early valves. They both are great heads. 

Yes, agree p79 also very good. Being pedantic, you don't *have* to skim it and shim it. There are better (if more expensive) alternatives. 

On 4/2/2021 at 12:09 PM, Wally said:

I was reading this website below and wondered thoughts on "best" head.

http://www.zhome.com/ZCMnL/tech/head.htm

Funny how the less defined the question is the more discussion it generates.  "wondered thoughts on "best" head" >>>> go!

Less is best. 

2 hours ago, jonbill said:

Yes, agree p79 also very good. Being pedantic, you don't *have* to skim it and shim it. There are better (if more expensive) alternatives. 

What are the alternatives to skim/shim?  Budget be damned.

1 hour ago, grannyknot said:

What are the alternatives to skim/shim?  Budget be damned.

Work by a talented machinist who can also weld well.

You guys haven’t even mentioned the best head yet - MN -47 . Because it wasn’t in the Z , people forget about it . It has the best all around combination for a street motor . Maybe not the best race head , but best bolt on for power with the least amount of work . Small chamber - high quench , good casting .